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with
ABHISHEK K RB.Tech - Aerospace, Alliance UniversityCBSE Expert | Inventor of RocketPro6+ Years Teaching Exp | Mentored more than 5000 studentsHelped 1000s of students get 10 CGPA in CBSE X
Focus of Concave & Convex Mirrors
Source: https://gifer.com
/en/DLB
N
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Ray Diagrams of Convex Mirrors
Focus
Sign Convention of Mirrors & Mirror Formula
Refraction and Refractive Index
Standard Incident Rays
Ray Diagrams of Concave Mirrors
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Ray Diagrams of Concave & Convex Lenses
Sign Convention of Lenses & Lens Formula
Numericals on Mirrors, Lenses & Refractive Index
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Ray Diagrams of Convex Mirrors
Focus
Sign Convention of Mirrors & Mirror Formula
Refraction and Refractive Index
Standard Incident Rays
Ray Diagrams of Concave Mirrors
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Ray Diagrams of Concave & Convex Lenses
Sign Convention of Lenses & Lens Formula
Numericals on Mirrors, Lenses & Refractive Index
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Convex Mirror Concave Mirror
A B
Q1. A mirror with its reflecting surface curved inwards is called
Plane mirror
C
None of the above
D
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Convex Mirror Concave Mirror
A B
Q1. A mirror with its reflecting surface curved inwards is called
Plane mirror
C
None of the above
D
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Convex mirror Concave mirror
Plane mirror
None of the above
A B
C D
Q2. If size of the image is not same as size of the object then, it is not a
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Convex mirror Concave mirror
Plane mirror
None of the above
A B
C D
Q2. If size of the image is not same as size of the object then, it is not a
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PoleCentre of curvature
Principal axis
Aperture
A B
C D
Q3. The entire reflecting area of mirror is called?
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PoleCentre of curvature
Principal axis
Aperture
A B
C D
Q3. The entire reflecting area of mirror is called?
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ANSWER : Pole
Q6. Midpoint of the aperture of a mirror is called ……..
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FOCUS
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Let’s consider an incident ray in a concave mirror?
Incident ray
Concave mirror
C
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Where would the reflected ray go?
1
2
3
?
??
C
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Now let’s apply law of reflection to concave mirror
Incident ray
Concave mirror
C
What is angle of incidence?
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Reflected ray & Normal
Incident ray & normal
A B
Angle of incidence is the angle between?
None of theseIncident ray and reflected ray
C D
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Reflected ray & Normal
Incident ray & normal
A B
Angle of incidence is the angle between?
None of theseIncident ray and reflected ray
C D
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Where is the normal in a concave mirror?
Incident ray
C
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Normal of a plane mirror
Plane mirror
Normal
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Concave mirror
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Let’s draw a normal on a circle.
O
P
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Normal is perpendicular to the tangent
P
ONorm
al
Normal passes through the centre
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So, we can easily find the direction of the reflected ray
C
B
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So, we can easily find the direction of the reflected ray
C
B
BC is the normal
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So, we can easily find the direction of the reflected ray
C
Bi
BC is the normal
Measure i
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So, we can easily find the direction of the reflected ray
BC is the normal
Measure iDraw r at point B such that i = r
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Let’s consider another ray
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Let’s consider another ray
The ray passes through the same point on the principal axis
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All rays pass through the same point on the principal axis after reflection.
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All rays pass through the same point on the principal axis after reflection.
The point is called FOCUS and is denoted by F
F
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All the rays converge at one point .
Focus is a point at which rays of light meets after Reflection
Concave mirror → Converging mirror
F
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Let’s consider convex mirror
C
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Let’s consider convex mirror
Where will the reflected ray go?
C
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Let’s consider convex mirror
Where will the reflected ray go?
C
ri
This is the reflected ray
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After reflection, they seem to spread out.- (DIVERGE)
Convex mirror → Diverging mirror
C
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To an observer it appears that rays are originating from a point behind the mirror.
CF
That is FOCUS in case of a convex mirror
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In Concave Mirror Focus is in front of the mirror.
In Convex Mirror Focus is behind the the mirror.
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In Concave Mirror Focus is in front of the mirror.
In Convex Mirror Focus is behind the the mirror.
Real Focus
Virtual Focus
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Relation between R and F
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We Know focus lies on the principal axis.
Concave mirror
CP
F C
Convex mirror
FP
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What is the distance between pole and centre of curvature
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What is the distance between pole and centre of curvature
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Similarly , distance between pole and focus is called Focal length. Denoted by ‘f ‘
Concave mirror
CP
F C
Convex mirror
FP
f f
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Focal length is half the radius of curvature
Concave mirror
CP
F C
Convex mirror
FP
f fR R
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Focal length is half the radius of curvature
Concave mirror
CP
F C
Convex mirror
FP
f fR R
F= R2
R = 2 F
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V I P
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Q1. To draw a normal at point S, we should join point S to
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P Q
O S
A B
C D
Q1. To draw a normal at point S, we should join point S to
![Page 59: with¤क...Let’s consider convex mirror Where will the reflected ray go? C r i This is the reflected ray Af ter reflection, they seem to spre ad out.- (DIVERGE) Convex mirror](https://reader035.vdocuments.mx/reader035/viewer/2022071609/6148cb812918e2056c22ebb4/html5/thumbnails/59.jpg)
P Q
O S
A B
C D
Q1. To draw a normal at point S, we should join point S to
![Page 60: with¤क...Let’s consider convex mirror Where will the reflected ray go? C r i This is the reflected ray Af ter reflection, they seem to spre ad out.- (DIVERGE) Convex mirror](https://reader035.vdocuments.mx/reader035/viewer/2022071609/6148cb812918e2056c22ebb4/html5/thumbnails/60.jpg)
All the parallel rays meet at the same point after reflection
All the parallel rays converge after reflection
A ray parallel to the principal axis pass through the center of curvature after reflection
All the rays parallel to the principal axis meet at the focus
A
B
C
D
Q2. Which of the statements is not true about a concave mirror?
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All the parallel rays meet at the same point after reflection
All the parallel rays converge after reflection
A ray parallel to the principal axis pass through the center of curvature after reflection
All the rays parallel to the principal axis meet at the focus
A
B
C
D
Q2. Which of the statements is not true about a concave mirror?
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15 cm 20 cm
10 cm 5 cm
A B
C D
Q3. If focus is located 10 cm from the pole , What is the value of R ?
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15 cm 20 cm
10 cm 5 cm
A B
C D
Q3. If focus is located 10 cm from the pole , What is the value of R ?
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15 cm 10 cm
30 cm 60 cm
A B
C D
Q4. If the radius of curvature of a convex mirror is 30 cm, What will be the focal length? [Boards 2011]
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15 cm 10 cm
30 cm 60 cm
A B
C D
Q4. If the radius of curvature of a convex mirror is 30 cm, What will be the focal length? [Boards 2011]
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100 cm Convex mirror
25 cm Convex mirror
25 cm Concave mirror
100 cm Concave mirror
A B
C D
Q5. The outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror. What will be the focal length of this mirror? Which type of spherical mirror will it provide?
[Boards 2010]
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100 cm Convex mirror
25 cm Convex mirror
25 cm Concave mirror
100 cm Concave mirror
A B
C D
Q5. The outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror. What will be the focal length of this mirror? Which type of spherical mirror will it provide?
[Boards 2010]
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Q6. The point where rays parallel to principal axis meet after reflection is
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AKPRO
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